How many religions are in the world?

Depending on how you define and count them, anthropologists and historians estimate that there are between 4,200 and 10,000 distinct religions and faith groups in the world today.

While that number sounds massive, the vast majority of those are smaller, regional, or indigenous folk traditions. When it comes to what the global population actually practices, the landscape is heavily dominated by just a few major groups.

The Big Four (77% of the World)

Just four major religious traditions account for over three-quarters of the human population:

• Christianity (~2.3 to 2.5 Billion): The largest global religion, which includes massive internal diversity with over 45,000 different denominations (like Catholicism, Protestantism, and Eastern Orthodoxy).
• Islam (~2.0 to 2.1 Billion): The fastest-growing major religion, primarily divided into Sunni and Shia traditions, alongside dozens of smaller sects.
• Hinduism (~1.2 Billion): Concentrated heavily in South Asia, it is one of the world’s oldest continuous religious traditions, encompassing many different philosophies and schools of thought.
• Buddhism (~320 to 500 Million): Founded in ancient India and widely practiced across East and Southeast Asia, with major branches including Theravada, Mahayana, and Vajrayana.